[isenblatter]

First off, great find. My only LFS has a dismal selection of driftwood, the largest piece being about 8" long, and 5" high...Try going to the store and buying a new garbage can, or measure it and see how large it is and buying a large plastic storage container from your local SuperCenter. It may not be as fast as boiling, but you can put pretty hot water in either one of those containers before worrying about them melting.

 

[isenblatter]

Another idea, do you have a smaller tank that it would fit in? That way you could let it leach into something other then your primary tank?